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power_supply: allow power supply devices registered w/o wakeup source

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Currently, all the power supply devices are registered with wakeup source,
this results in that every power_supply_changed() invocation brings
the system out of suspend-to-freeze state.

This is overkill as some device drivers, e.g. ACPI battery driver,
have the ability to check the device status and wake up the system
from sleeping only when necessary.

Thus introduce a new API which allows device to be registered
w/o wakeup source.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Zhang Rui 2014-05-28 15:23:37 +08:00 committed by Rafael J. Wysocki
parent 1ac5aaa672
commit 9113e26076
2 changed files with 15 additions and 2 deletions
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15
drivers/power/power_supply_core.c
View File

@ -537,7 +537,7 @@ static void psy_unregister_cooler(struct power_supply *psy)
}
#endif
int power_supply_register(struct device *parent, struct power_supply *psy)
int __power_supply_register(struct device *parent, struct power_supply *psy, bool ws)
{
struct device *dev;
int rc;
@ -568,7 +568,7 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
}
spin_lock_init(&psy->changed_lock);
rc = device_init_wakeup(dev, true);
rc = device_init_wakeup(dev, ws);
if (rc)
goto wakeup_init_failed;
@ -606,8 +606,19 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
success:
return rc;
}
int power_supply_register(struct device *parent, struct power_supply *psy)
{
return __power_supply_register(parent, psy, true);
}
EXPORT_SYMBOL_GPL(power_supply_register);
int power_supply_register_no_ws(struct device *parent, struct power_supply *psy)
{
return __power_supply_register(parent, psy, false);
}
EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
void power_supply_unregister(struct power_supply *psy)
{
cancel_work_sync(&psy->changed_work);

2
include/linux/power_supply.h
View File

@ -264,6 +264,8 @@ static inline int power_supply_is_system_supplied(void) { return -ENOSYS; }
extern int power_supply_register(struct device *parent,
struct power_supply *psy);
extern int power_supply_register_no_ws(struct device *parent,
struct power_supply *psy);
extern void power_supply_unregister(struct power_supply *psy);
extern int power_supply_powers(struct power_supply *psy, struct device *dev);